Motor driven cleaning tool



' Junet17, 1969 J. v. EMERY 3,450,215

mowon DRIVEN CLEANING TOOL Filed July 12, 1966 IN VEN TOR.

Jain K 5076/;

Warez/6L. Bazes United States Patent 3,450,215 MOTOR DRIVEN CLEANING TOOL John V. Emery, 2103 Walnut, Odessa, Tex. 79760 Filed July 12, 1966, Ser. No. 564,619 Int. Cl. B25d 11/02; H02k 7/14 US. 'Cl. 173-117 5 Claims ABSTRACT OF THE DISCLOSURE This invention relates to an impact type tool. The device is especially'adapted to be used in the field at the job site by welders so as to enable proper preparation of metal that is to be joined by welding. The device provides a means by which the welded joint and the attendant splatter, that is, the flux and bits of molten metal in proximity to the welded joint, may advantageously be removed in a rapid and efiicient manner.

Heretofore tools of the instant type have necessarily been of the pneumatic impact type, or of the large A.C. motor direct driven impact type, wherein the tool accordingly was too large and unwieldy for field work. The welder usually considers such a large tool to be impractical for field use, and accordingly generally resorts to the time consuming task of manually chipping and cleaning his work with What is termed a chipping hammer.

It is therefore desirable to have a lightweight, motor driven cleaning tool that may be readily carried about the job site with a minimum of elfort. It is further desirable that such a tool be able to operate on either A.C. or DC. current so as to enable the welder to plug the tool directly into his electric arc welding machine, since most portable heavy duty welding machines are provided with a receptacle for 110 V. DC. current. It is also desirable to have an electrical cleaning tool that is easily disassembled in the field so as to enable dressing various tools or implements used therein, as well as changing from one type cleaning implement to another. It is further desirable thas such a tool be rugged in construction, simple in design, and low in cost.

It is accordingly one of the objects of this invention to provide an electrically driven tool having the above outlined desirable features.

It is also an object of this invention to provide an electrical cleaning tool which overcomes the above described as well as other defects found in similar prior art devices. 7

Another object of this invention is to provide an electrical tool that may be used in either the field or the shop that includes removable parts associated therewith so as to readily enable various type implements used with the device to be quickly interchanged.

Still another object of this invention is to provide a device having means for producing reciprocatory motion in a first spring whereby a member associated with a second spring will reciprocate sympathetically with the means producing the motion.

A still further object of this invention is to provide an A.C./D.C. motor driven tool, wherein the implement associated therewith is held between two oppositely bi- 3,450,215 Patented June 17, 1969 ased springs so as to allow reciprocatory motion of the implement upon energization of the motor.

These objects are attained in accordance with the present invention by providing an implement having an enlarged annular shoulder thereon and with springs compressed with the shoulder therebetween in a manner that reciprocatory motion longitudinally of one spring produces reciprocatory motion in the implement.

These and other objects and advantages of the current invention will become apparent to those skilled in the art upon consideration of the following detailed description of the preferred embodiments thereof, reference being had to the accompanying drawings; wherein:

FIGURE 1 is a perspective view illustrating an electrical cleaning tool made in accordance with the present invention;

FIGURE 2 is a side elevational view of the device seen in FIGURE 1 with some parts being cutaway and shown in section so as to illustrate some of the details of the instant invention;

FIGURE 3 is an exploded view of a portion of the device seen in FIGURES 1 and 2;

FIGURE 4 shows an additional implement which may be interchanged for the one disclosed in FIGURES l, 2, and 3;

FIGURE 5 shows still another implement that may be substituted for the one disclosed in FIGURES 1, 2, 3, and 4; and FIGURE 5 shows still another implement that may be substituted for the one disclosed in the other figures.

As seen in FIGURE 1 in conjunction with FIGURES 2 and 3, the electrical motor driven cleaning tool is comprised of an electric motor driven part, indicated generally by the arrow at numeral 12, and hereinafter called the power section. The driven part is indicated generally by the arrow at numeral 14. The power section of the device indirectly imparts reciprocatory motion to the implement 16, which may be in several dilferent forms other than that of the illustrated chisel. The chisel, or implement 16, has a point or cutting edge 17 The power section 12 includes a handle 18 which may be in the form of a pistol grip so as to conveniently fit the hand of the operator. The electric motor of the device is preferably housed withn the member indicated by numeral 19, which has a normally open or normally de-energized switch (not shown) actuated by the trigger 20.

The driven section 14 includes a thimble 22 that is removably attached to the barrel 24.. The barrel 24 is rigidly affixed in abutting relationship to a top casing, or closure member 28 by a triangular load transferring member 30 rigidly attached to the barrel at 24 by welding or the like, and includes an outturned flange 31 having apertures therein to receive machine screws 32 which completes the attachment means of the barrel. The top closure means is held rigidly attached to the power section by screws 32'.

This construction permits the driven section 14 to be mated with any one of a number of different power sections 12 that are readily available on todays market. For example, the driven section 14 can be readily substituted for the sawing mechanism of a common sabersaw merely by removing the components relating to the saw-blade and providing the reciprocating shaft of the power section with a member 48. The driven section is secured in place by member 30 which is bolted into place onto the power section by suitably aperturing the member 30 so as to provide screw holes that are aligned with the same tapped holes originally used for retaining the components relating to the saw blade. Thus, the mechanism, such as illustrated in FIGURE 3, provides 3 a conversion unit that modifies or converts a saber-saw into a motor driven cleaning tool.

Springs 34 and 36 are slidably received within the barrel and thimble in compressed relationship with respect to the enlargement, one face of which is seen at 38. The opposite extremity of the implement 16 is ground into the form of a chisel. The first spring 34 is held in compressed relationship between the before mentioned face at 38 and a second face 40, while the second spring 36 is held in compressed relation between a first shoulder 42 of the thimble and a second shoulder 44 of the implement. The first spring 34 is driven by reciprocatory motion of member 4 8 which in turn is driven by the motor of the power section.

As best seen in FIGURE 2, the thimble 22 has an inside surface 52 that defines an annular cylindrical surface slightly larger in inside diameter than the outside diameter of spring 36. The thimble is threaded as at 54 and abuts against a shoulder 56 provided between the thimble and the barrel. The thimble has a longitudinally extending passageway 58 of reduced diameter which slidably receives the implement 16 therethrough. The depending end of the thimble is preferably cone-shaped or sloped as at 60, so as to provide a depending face 62. The inside diameter 64 of the barrel is slightly larger than the outside diameter of the first spring 34. The inside diameter 64 of the barrel and the inside diameter 52 of the thimble together form a chamber that houses the springs and part of the chisel, in a manner best seen in FIGURE 2.

As seen in FIGURE 3, the driven section of the device may be readily disassembled so as to enable other implements, such as illustrated in FIGURES 4 or 5, to be substituted for that implement indicated by the numeral 16. Still looking at FIGURE 3, the various disassembled portions of the driven section of the device includes the thimble 22, the barrel 24, the implement 16, and springs 34 and 36. The springs 34 and 36 in the specific example herein described are preferably 0.875 inch in outside diameter, two inches long, and wound from 0.125 inch thick wire so as to produce seven turns when in the uncompressed position. The springs, when new, react so as to be compressed one-quarter inch in length when a load of thirty-four pounds is imposed thereon. The power section drives the member 48 in a straight line along a path one inch long.

The implement .116 disclosed in FIGURE 4 will be recognized by those skilled in the art as being similar to a concrete drill of the type that is commonly handheld and hit with a hammer with repeated blows in order to drill through concrete. The device 116 of FIGURE 4 may be substituted for the implement 16 of FIGURES 1, 2, and 3 wherein reciprocal action provided in the same before described manner set forth in conjunction with FIGURES 1, 2, and 3 will provide the necessary energy to drill through concrete, rock, and the like. The enlargement forming faces 138 and 144 hold the springs 34 and 36 in compressed condition in a manner similar to that described above relative to the chisel 16.

The implement 216 disclosed in FIGURE may be substituted for the implement 16 of FIGURES 1, 2, and 3, and includes a file rigidly affixed at an angle at the free end thereof. The enlarged end of the implement is provided with first and second faces 238 and 244 that cooperate with springs 34 and 36 in the same before described manner of FIGURES 1 through 4 so as to be moved in a longitudinal direction with sufficient force to smoot or file various surfaces. The enlargement threadedly engages the implement so as to permit the installation of spring 34 since the spring will not usually fit over the file attached to the free end of the implement. Therefore, the enlargement carrying faces 238 and 244 is unscrewed, spring 34 placed thereon, the enlargement screwed back into place, whereupon the implement may 4 then be properly installed in a'manner similar to that dis closed in FIGURES l, 2, and 3.

As seen in FIGURE 2 in conjunction with the remaining figures, the enlarged portion forming faces 38 and 44 are in compressed relationship between springs 34 and 36. Reciprocation of member 48 imparts reciprocatory motion or vibratory motion to spring 34 which in turn causes the implement .16 together with spring 36 to sympathetically vibrate in a longitudinal direction with respect to the barrel and thimble in accordance with the frequency and magnitude of the energy imparted to the spring 34 by the reciprocating member 48. Accordingly, energization of the power section 12 causes the implement 16 to vibrate or reciprocate longitudinally of the thimble and barrel, so as to provide energy which may be dissipated in cleaning metal as well as performing other duties, as pointed out above.

An interesting feature of the present invention is that the implement may be contacted by the hand, or other body portions, while reciprocating with no injury resulting therefrom; yet, when held adjacent to a solid material such as steel, wood, or bone structure, the surface of the material may be readily cleaned of splatter, metallic projections, scale, or rust. Since the implement is non-injurious to resilient material, such as animal flesh, yet readily cuts into non-resilient material, such as steel or bone structure, the device is particularly adapted to filing, sawing, or chipping bone structure and hence finds value as a surgical tool in addition to having value as a welding tool.

Another particular use of the device is in cutting or filing any material that would ordinarily be injured by a tool of direct driven action hanging up while energized.

It will now be appreciated by those skilled in the art that the present novel device is exceptionally useful as a portable cleaning tool in the field since it may be powered directly from the -volt supply of a common welding machine. The device is also useful in the shop and may be operated from 110 volts A.C. current. It is contemplated that other sources of power may be used in conjunction with the tool.

With the power unit delivering the proper number of strokes per minute, it is believed that a harmonic-like relationship exists between member 48, the first and second springs, and the implement so as to provide maximum input of energy to the implement from the member 48.

Those skilled in the art, now having been taught how to build and construct applicants device, may perceive a manner by which even greater power may be delivered to the implement by the member 48 by changing springs or the amplitude of the stroke.

While I have shown and described what I believe to be the preferred form of my invention, it will be understood by those skilled in the art that various changes may be made without departing from the broad scope of the invention, as defined in the appended claims.

I claim:

1. A device for producing reciprocal motion in an implement including a power section and a driven section;

said driven section including a housing, a first spring,

and a second spring;

said implement having a free end and a spring engaging end with said spring engaging end being slidably received within said housing and said free end extending therefrom;

said second spring being slidably received within said housing and about said implement and between the free end and the spring engaging end of said implement;

said power section including a motor driven reciprocating member adapted to move longitudinally of said housing;

said first spring being slidably mounted in compressed condition within said housing and between said spring engaging end of said implement and said member;

said housing being removably attached to said power section;

said housing includes a thimble and a barrel with said thimble being removably attached to said barrel and said barrel being attached to said power section; said housing including means forming a cylindrical chamber within which there is slidably received said springs, said member, and said spring engaging end of said implement;

said thimble including a depending end having a reduced passageway communicating with said cylindrical chamber for slidably receiving said implement;

said reduced passageway having means forming a shoulder where the passageway joins the cylindrical chamber;

whereby said springs are spaced apart by said spring engaging end of said implement with said second spring being held compressed against said shoulder to thereby permit reciprocal motion to be imparted to said implement upon reciprocation of said member.

2. The device of claim 1 wherein said implement includes means forming a chisel on the free end thereof.

3. The device of claim 1 wherein said implement has means forming a file arranged at an angle with respect to and at the free end thereof, and said spring engaging end is removably threadedly fitted to the implement.

4. The device of claim 1, wherein said power section includes an A.C./D.C. electric motor associated with said member whereby said motor is adapted to be powered by current from an arc welder.

5. The device of claim 1 wherein said spring engaging end of said implement includes an enlargement having a first and second face;

said second spring being compressed between said abutment and said first face; and

said first spring being compressed between said second face and said member.

References Cited UNITED STATES PATENTS 427,070 5/1890 Gibbs 310- 1,813,087 7/1931 Sandage 173118 XR 2,942,589 6/1960 Wacker 173118 XR 3,119,423 1/1964 Weick 227-147 XR MILTON O. HI'RSHFIE'LD, Primary Examiner. D. F. DUGGAN, Assistant Examiner.

US. Cl. X.R. 

